The timber a Central Coast house stands on, and the termites that eat it
In NSW, the most timber damage of all is done by subterranean termites, the ones also known as white ants. If a house is being built or renovated, the state records that the builder is responsible for installing a termite risk management system for the work.
The timber pest facts on this page are the NSW EPA's and the state's building guidance, from the pages linked in the footer.
What does the damage, and why the coast suits it
The EPA's timber pest pages are blunt about the main offender: of all the timber damage in this state, the most is done by the subterranean termite, the white ant. They nest below ground or in mounds, and mud tunnels are how they get to the timber whose cellulose they eat.
Termites are not the only thing working on a house. The EPA records that most softwood timbers have to be treated, or fungi and insects will get to them: the fungi rot the timber, the insects damage and weaken it.
The moisture detail is the one a coastal household can act on. The spores are already in the air, the EPA notes, and they only get a hold when timber's moisture content sits above 20 per cent and below 60. The decay itself comes in three kinds: brown rot, white rot and soft rot.
Borers are the other common visitor. The EPA records that some beetle larvae feed on timber, and that the lyctids can spend more than a year inside the wood they are eating before the adults come out through small shot holes. The giveaway is often on the shelf rather than in the wood: the fine dust called frass collects on whatever sits below those holes.
On a coast there is a third category: marine borers, which live in the sea and include shipworms, molluscs that grow up to 45 centimetres long. Isopods go for seawater-soaked timber too; they are far smaller, about 3 millimetres, and look like slaters. In numbers, they strip the timber away layer by layer. That is timber in seawater, not the roof space.
The builder's side of the bargain
The state's building guidance puts a duty on the builder: if a home is being built or renovated, the builder is responsible for installing a termite risk management system for the work.
Its advice for a new house starts earlier than that: research materials that are less attractive to termites, borers and rot. It also states the two halves of the whole system in one sentence: an effective termite risk management system, combined with regular inspections, can significantly reduce the risk of termite damage.
One warning there, in the state's own words: be aware that some building contracts may try to shift the builder's liability for installing an appropriate TRM system to the owner, so read the contract carefully and understand who is accountable for termite protection.
The national construction code's explanatory material makes the same point from the other end: in addition to correct installation of a termite management system, its effectiveness will rely on regular maintenance and competent inspection.
The CSIRO's building technology resource puts a number on the interval where a treatment provides no lasting protection: regular inspections, at least annually, are required.
A building inspection and a timber pest inspection are not the same thing
This is the comparison the state's pages set out in two different places, and the one that decides what to book before buying a house.
| A building inspection | A timber pest inspection | |
|---|---|---|
| What it covers | This report should identify any visual damage caused by termites. | This is the inspection that covers whether termites and other pests that destroy timber are still around. |
| What the state says to do | A building report does not say whether termites are still active, so the state's advice is to book a pest inspection as well. | That is the inspection that answers the question, and the state says to get one especially where termites are a known problem. |
| Who the EPA requires to be licensed | An inspection with no pesticide used sits outside the EPA licence requirement. | From the dates the EPA sets out, a pesticide against termites or other timber pests needs a timber pest management licence. |
The licence a treatment needs, and the one it does not
The EPA records that a new licence for timber pest work is being phased in for NSW, and that from the dates the authority sets out, that licence is what a technician needs to use pesticides against termites and other timber pests. It also allows non-timber pest control work, and the EPA's own page on pest management technicians, fumigators and training permits carries those dates.
The pest management technician licence allows a technician to apply pesticides other than fumigants against pests for a fee or a reward, or for a public authority.
A five-year pest management technician licence held before 17 December 2021 still covers commercial timber pest treatments until the later of its expiry and 17 December 2023.
There is an exception a householder may meet: timber pest inspections on their own, with no pesticide used, and barriers that contain no pesticide, sit outside the EPA licence requirement altogether.
Where to ask a question about termites
The state's termite page lists three lines for information: the Australian Environmental Pest Management Association on 1300 307 114 or (07) 3268 4210, the NSW Department of Primary Industries on (02) 6391 3100, and the Department of Health information line on 1800 020 653 for information about available treatments and hazards for termite protection.
The short version of everything above fits in one sentence from that page: an effective system plus regular inspections. Between the two, the inspections are the half a householder controls, and they are also the half that catches a problem while it is still small.
For a house between the water and the bush edge, the honest summary is the state's own: a termite risk management system, installed as the builder is required to install it, plus regular inspections, at least annually as CSIRO's guide puts it. Everything else on this page, the licence, the frass on the shelf, the mud tunnels, is how a householder reads what the inspections find.